try using context as condition

Author: jsji

.github/workflows/sycl-detect-changes.yml

@@ -19,6 +19,7 @@ jobs:
     steps:
       - name: Check file changes
         uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36
+        if: ${{ context.payload.pull_request.changed_files }} < 500
         id: changes
         with:
           filters: |